Briefcase



FIG. 1 is a front and side perspective view of a briefcase showing my new design;

FIG. 2 is a rear and side perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is an enlarged partial top perspective view thereof; and,

FIG. 5 is an enlarged partial side elevation view thereof showing a belt and buckle assembly. 

The ornamental design for a briefcase, as shown and described. 